"The Religion in the sight of Allah is Islam." (Qur'an 3:19)

"If anyone desires a religion other than Islam (Submission to Allah), Never will it be accepted of him; and in the Hereafter he will be in the ranks of those who have lost (burnt in hell)."(Qur'an 3:85)

"To thee We sent the Scripture in truth, confirming the scripture that came before it, and guarding it in safety:..." (Qur'an 5:48)